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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '39f30ceef28025f25399d7a88b103c83fc326504f8f85ca5abf24d1da0c84ed6' 
  AND token = 'bE6i9EMe6u+wdOxScXLQl3KlVRkIz+Uqhd5/tAuo/YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}